Explain the difference between the different tiers of violations. Which tier is the most serious?

In the context of water distribution violations, the tiers are classified based on the severity and potential impact on public health and safety. Tier 1 violations are associated with situations that pose an immediate and significant threat to public health, requiring rapid notification and remedial actions within a strict timeframe. The 24-hour response requirement reflects the urgency of these violations, as they require swift communication with both the public and regulatory authorities.

This quick notification is critical to ensure that any necessary precautions can be quickly implemented to protect consumers and mitigate health risks. Examples of Tier 1 violations can include incidents of contamination or failure to provide adequate treatment, thus making immediate reporting essential.

The other tiers involve less immediate threats or allow for longer response times. For example, Tier 2 violations typically denote violations that, while still serious, do not require immediate action within 24 hours, and can instead be addressed over a longer time frame. Tier 3 violations emphasize issues where the health impact is minimal or unlikely, allowing even more extended periods before a response is required.

In summary, B is correct because Tier 1 violations must be addressed within 24 hours due to their potential to severely impact public health, making this tier the most serious regarding urgency.